MetadataHeader

class \Symfony\Component\Mime\Header\AbstractHeader implements \Symfony\Component\Mime\Header\HeaderInterface
- class \Symfony\Component\Mime\Header\DateHeader extends \Symfony\Component\Mime\Header\AbstractHeader
- class \Symfony\Component\Mime\Header\IdentificationHeader extends \Symfony\Component\Mime\Header\AbstractHeader
- class \Symfony\Component\Mime\Header\MailboxHeader extends \Symfony\Component\Mime\Header\AbstractHeader
- class \Symfony\Component\Mime\Header\MailboxListHeader extends \Symfony\Component\Mime\Header\AbstractHeader
- class \Symfony\Component\Mime\Header\PathHeader extends \Symfony\Component\Mime\Header\AbstractHeader
- class \Symfony\Component\Mime\Header\UnstructuredHeader extends \Symfony\Component\Mime\Header\AbstractHeader
  - class \Symfony\Component\Mailer\Header\MetadataHeader extends \Symfony\Component\Mime\Header\UnstructuredHeader
  - class \Symfony\Component\Mailer\Header\TagHeader extends \Symfony\Component\Mime\Header\UnstructuredHeader
  - class \Symfony\Component\Mime\Header\ParameterizedHeader extends \Symfony\Component\Mime\Header\UnstructuredHeader